Speaker 1: Hey everyone, and welcome to another deep dive with us.
Speaker 2: It's great to be here.
Speaker 1: Today. We're taking a look at a book by Kyle
Speaker 1: Simpson called You Don't Know JSES six and Beyond. Yeah, specifically,
Speaker 1: we'll be focusing on the syntax and organization chapters to
Speaker 1: see how they can help us write cleaner and more
Speaker 1: modern JavaScript code.
Speaker 2: Absolutely, two chapters packed with insights that can really level
Speaker 2: up your JavaScript game.
Speaker 1: Okay, So to kick things off, I think it's worth
Speaker 1: highlighting the fact that JavaScript evolves so rapidly these days.
Speaker 2: Right, oh yeah, definitely gone are the days of waiting
Speaker 2: years for a new version.
Speaker 1: Right.
Speaker 2: ES six was a big shift, and the language is
Speaker 2: constantly changing now, so it's really important for us the
Speaker 2: developers to stay on top of things, always be learning,
Speaker 2: right exactly, embrace the evolution.
Speaker 1: Yeah, okay, So let's dive into some of these evolutionary changes,
Speaker 1: starting with block scope declarations using let and constant sounds good. Now,
Speaker 1: Before EES six we only had var, and I think
Speaker 1: we've all run into some of those head scratching moments, right.
Speaker 2: Well, for sure, var was function scoped, yeah, which you
Speaker 2: know sometimes led to some confusing bugs.
Speaker 1: Yeah, definitely especially in.
Speaker 2: Larger projects where you might have variables with the same
Speaker 2: name in different parts of the code.
Speaker 1: Exactly. So how do let and constant address this?
Speaker 2: Well, Let in constant introduced block level scoping mm hmmm,
Speaker 2: which means they're only accessible within the block of code
Speaker 2: where they're defined.
Speaker 1: Okay, So it's all about creating these clear boundaries precisely.
Speaker 2: Think of it as creating a more contained environment for
Speaker 2: your variables, preventing those accidental collisions and unexpected behaviors.
Speaker 1: Got it now? I noticed that Kyle Simpson is a
Speaker 1: big advocate for declaring let at the top of the scope.
Speaker 1: Why is that?
Speaker 2: Yeah, he's got a strong point there. Declaring let at
Speaker 2: the top makes it very clear what variables are in
Speaker 2: play within that scope, and it helps avoid what's called
Speaker 2: the temporal dead zone.
Speaker 1: What's that?
Speaker 2: It's an error you can run into if you try
Speaker 2: to use a variable before it's been declared.
Speaker 1: Ah. Okay, So it's like setting the ground rules up
Speaker 1: front exactly.
Speaker 2: It makes you code more predictable and less prone to errors.
Speaker 1: Awesome. And what about const When should we use that?
Speaker 2: Const is for values that you know won't change throughout
Speaker 2: your code, like say the mathematical constant pi, right, or
Speaker 2: maybe some configuration settings. Yeah, it makes it super clear
Speaker 2: that those values are meant to be constant.
Speaker 1: Makes sense. It's like a promise to yourself and your
Speaker 1: fellow developers that this value is set in stone exactly.
Speaker 2: Yeah. And there's a chance it might even help the
Speaker 2: JavaScript engine optimize things behind the scenes.
Speaker 1: Dot it so let for variables that might change cost
Speaker 1: for rock solid values. Perfect, all right, Moving on to
Speaker 1: something a bit more flexible now, the spread rest operator.
Speaker 2: Ah, yes, the versatile operation.
Speaker 1: It's like a Swiss army knife, right exactly.
Speaker 2: It can do double duty, either spreading out the elements
Speaker 2: of an iterable like an array, or gathering values into
Speaker 2: an array.
Speaker 1: It's like a transformer that can adapt to different situations.
Speaker 2: I like that analogy. So, for example, imagine you have
Speaker 2: an array of numbers and you want to pass them
Speaker 2: as individual arguments to a function.
Speaker 1: Right, which was a bit of a pain before sixty.
Speaker 2: Exactly, you'd have to resort to tricks like using apply.
Speaker 2: But with a spread operator, you can just use those
Speaker 2: three dots boom, and it unpacks those array elements into
Speaker 2: individual arguments, so much cleaner.
Speaker 1: What about the rest operator, how does that work.
Speaker 2: It's like the flip side of the coin. Instead of
Speaker 2: spreading out, it gathers things together. Okay, let's say you
Speaker 2: have a function that needs to handle an unknown number
Speaker 2: of arguments. The rest operator lets you scoop them all
Speaker 2: up into a nice need array.
Speaker 1: So no more messing around with that clinky argument's objects.
Speaker 2: Nope, the rest operator is much more elegant.
Speaker 1: I'm sold now onto something that feels like a breath
Speaker 1: of fresh air. Default parameter values, Oh yeah, those are great.
Speaker 2: They might seem simple, but they really improve code clarity.
Speaker 1: I know, right, I've written so much code over the
Speaker 1: years checking for undefined values.
Speaker 2: I feel you well. With default parameters, you can set
Speaker 2: a default value right in the function definition.
Speaker 1: It's like having a backup plan built in exactly.
Speaker 2: If the caller doesn't provide a value, the default just
Speaker 2: slides right in.
Speaker 1: Love it. Now, what happens if someone passes in a
Speaker 1: falsey value like zero or an empty string?
Speaker 2: That's the beauty of it. Yeah, default parameters handle those
Speaker 2: cases gracefully. They only kick in if the argument is
Speaker 2: actually missing.
Speaker 1: Ah, so it's not just a blind.
Speaker 2: Replacement, right, It's smarter than that.
Speaker 1: I like it, and we can even use more complex
Speaker 1: expressions for default values.
Speaker 2: Right, absolutely, any valid expression will do awesome.
Speaker 1: Okay, I'm really starting to see how these seemingly small
Speaker 1: changes really add up to make JavaScript more robust and expressive.
Speaker 2: It's all about giving you more control and flexibility totally.
Speaker 1: Now, let's talk about a feature that I find particularly elegant, destructuring.
Speaker 2: Destructuring is all about taking complex data structures like arrays
Speaker 2: and objects and extracting the values you need in a
Speaker 2: very concise way.
Speaker 1: It always looks so clean when I see it encode
Speaker 1: it is.
Speaker 2: Imagine you have an array representing a person's details like
Speaker 2: their name, age, and occupation. With destructuring, you can pull
Speaker 2: those values out into separate variables in a single line.
Speaker 1: So instead of writing multiple lines to access each element,
Speaker 1: it's all done in one go.
Speaker 2: Exactly. Yeah, and it's even more interesting with object destructuring. Oh. Also,
Speaker 2: you can extract properties from an object and assign them
Speaker 2: to variables using a similar syntax. Okay, but what's cool
Speaker 2: is that the target source pattern is reversed compared to
Speaker 2: object literals.
Speaker 1: Can you explain that a bit more sure?
Speaker 2: In an object literal, you'd write property value, but with
Speaker 2: destructuring its value variable. You're essentially specifying which property you
Speaker 2: want and where you want to put it.
Speaker 1: I see, it's like mirroring the structure of the object exactly.
Speaker 2: And just like with default parameters, you can provide default
Speaker 2: values in case a property is missing.
Speaker 1: So it's a robust way to handle data.
Speaker 2: Extraction absolutely, and we can even use destructuring and function parameters. Right.
Speaker 1: It's a fantastic way to unpack arguments.
Speaker 2: It makes your function definitions much more readable.
Speaker 1: Love it all, right, onto some enhancements for our good friend,
Speaker 1: the object literal.
Speaker 2: Object Literal's got some cool upgrades in ES six, like
Speaker 2: what Well. For one, we have concise methods, which provide
Speaker 2: a shorter way to define functions within objects.
Speaker 1: So less typing, more concise code exactly.
Speaker 2: And then there are computed property names.
Speaker 1: Ah, yes, I've seen those us.
Speaker 2: They allow you to use expressions to determine the names
Speaker 2: of properties dynamically.
Speaker 1: Okay, that's pretty handy when you don't know the property
Speaker 1: name in advance.
Speaker 2: It is. It avoids that awkward bracket notation we used to.
Speaker 1: Have to use much cleaner. And speaking of cleaner, let's
Speaker 1: talk about string interpolation. I love how ES six made
Speaker 1: working with strings so much easier.
Speaker 2: Template literals are a game changer totally.
Speaker 1: Using backticks, we can embed expressions directly into strings.
Speaker 2: It's so much easier to read than concatenating strings.
Speaker 1: Right, no more plus signs everywhere. But there's a catch, right,
Speaker 1: something about them being plain strings.
Speaker 2: Yeah, it's important to remember that template literals are immediately
Speaker 2: evaluated into plan strings. There's no intermediate template object or
Speaker 2: anything like that.
Speaker 1: Got it, So it's more like an inline evaluation, kind
Speaker 1: of like an ia.
Speaker 2: That's a good way to think about it.
Speaker 1: And multiline strings are a breeze with template literals too.
Speaker 2: Right, absolutely, they preserve white space and line breaks as
Speaker 2: you type them.
Speaker 1: So much better than the old days of backslashes and
Speaker 1: awkward line breaks.
Speaker 2: No more string concatenation headaches.
Speaker 1: Now onto a feature that sounds even more powerful, tagged
Speaker 1: template literals.
Speaker 2: Tag template literals takes string interpolation to the next level.
Speaker 1: How sound.
Speaker 2: You can attach a function a tag to a template literal,
Speaker 2: and that tag function gets the string parts and values
Speaker 2: as separate arguments. Okay, give you total control over how
Speaker 2: the string is put together.
Speaker 1: Wow, So you could write a tag function that say,
Speaker 1: uppercases all the values or even does something more complex
Speaker 1: like internationalization.
Speaker 2: Exactly, the possibilities are pretty much endless.
Speaker 1: That's awesome. Okay, Now onto a topic that's always a
Speaker 1: bit of a hot potato. Erow functions.
Speaker 2: Erofunctions are a concise way to write functions, but their
Speaker 2: main claim to fame is how they handle.
Speaker 1: This right, the dreaded this keyword.
Speaker 2: They solve a lot of the headaches we used to
Speaker 2: have with this binding.
Speaker 1: Yeah, I've spent countless hours trying to wrangle this into submission.
Speaker 2: I know the feeling. So with erofunctions, this is lexically bound.
Speaker 2: It means that this always refers to the context where
Speaker 2: the erowfunction was defined, not where it's called.
Speaker 1: Oh I see, so no more var self.
Speaker 2: This hacks exactly. Erofunctions make it much more predictable.
Speaker 1: Awesome. But I've also heard that they're not always the
Speaker 1: silver bullet. What are some of the caveats?
Speaker 2: Well, they don't have their own arguments object okay, and
Speaker 2: the way super works inside them is a bit.
Speaker 1: Different too, So it's important to use them intentionally, mainly
Speaker 1: for this binding behavior.
Speaker 2: Yeah, they're a powerful tool, but like any tool, it's
Speaker 2: good to know when and how to use it totally.
Speaker 1: All right, let's move on to a feature that simplifies looping.
Speaker 2: The four Ah yes, the four dot of loop is
Speaker 2: a much cleaner way to iterate over iterable.
Speaker 1: Objects compared to the old four loop with an index.
Speaker 2: Yeah, or even the four dot N loop, which iterates
Speaker 2: over object keys not values.
Speaker 1: Right right, So it's like taking a scenic route through
Speaker 1: an array, stopping at each value along the way.
Speaker 2: I like that. It's a much more intuitive way to
Speaker 2: work with iterables.
Speaker 1: And speaking of iterables, can you remind me what those are? Exactly?
Speaker 2: An interable is basically anything you can loop over arrays, strings, generators,
Speaker 2: even some custom objects.
Speaker 1: Okay.
Speaker 2: The key is that they have a special method called
Speaker 2: symbol dot iterator that defines how they should be iterated.
Speaker 1: So for prew dot love works its magic by tapping
Speaker 1: into that method.
Speaker 2: Exactly. It's a very elegant solution.
Speaker 1: I'm liking it.
Speaker 2: Now.
Speaker 1: What about those regular expression improvements?
Speaker 2: Ah yes. ES six introduced two new flags for regular expressions,
Speaker 2: the Unicode flag and the sticky flag.
Speaker 1: Okay, Unicode, I get that. Yeah, we need to handle
Speaker 1: emojis and other non asty characters these days, precisely.
Speaker 2: The Unicode flag ensures that your regular expressions work correctly
Speaker 2: with Unicode.
Speaker 1: And what about the sticky flag. What does that do?
Speaker 2: Sticky flag changes how the regular expression engine searches for matches. Okay,
Speaker 2: it makes the engine stick to the current position in
Speaker 2: the string, which is really helpful for certain parsing tasks.
Speaker 1: Ah, I see, So it's like giving the rejects engine
Speaker 1: a bit more context.
Speaker 2: Exactly. It's a powerful tool for certain situations.
Speaker 1: Awesome. Now onto some new editions that make working with
Speaker 1: numbers and strings even more convenient.
Speaker 2: EES six brought a bunch of new methods and features
Speaker 2: for both number and string Okay, Like what for numbers,
Speaker 2: we got new literal formats for binary, aucal and hexadecimal.
Speaker 1: Numbers, so we can finally write binary numbers directly in
Speaker 1: our code exactly.
Speaker 2: And for strings, there's a whole suite of new methods
Speaker 2: for handling Unicode characters, normalizing strings, and more.
Speaker 1: It's like EES six is making JavaScript a first class
Speaker 1: citizen in the world of Unicode.
Speaker 2: It definitely is.
Speaker 1: I'm all for it. Now, let's talk about something a
Speaker 1: bit more mind bending. Symbols.
Speaker 2: Symbols are a new primitive type in JavaScript. They're unique
Speaker 2: and immutable. Okay, I'm falling so far, which makes them
Speaker 2: perfect for creating hidden properties on objects.
Speaker 1: Hidden properties. That sounds intriguing.
Speaker 2: Imagine you're building a library and you need to store
Speaker 2: some internal data on an object, but you don't want
Speaker 2: to clash with any properties the user might be using.
Speaker 2: I see, symbols allow you to create these properties that
Speaker 2: are essentially invisible to the outside world.
Speaker 1: So it's like having a secret compartment in your objects exactly.
Speaker 2: It's a great way to improve encapsulation and prevent naming collisions.
Speaker 1: And because symbols are unique, there's no chance of accidentally
Speaker 1: using the same symbol twice.
Speaker 2: Precisely, they offer a level of safety and control that
Speaker 2: we didn't have before.
Speaker 1: That's really neat. Okay, Now let's dive into the world
Speaker 1: of iterators and generators.
Speaker 2: Iterators and generators are all about controlling the flow of data. Okay.
Speaker 2: An iterator is an object that defines a sequence of values, right,
Speaker 2: and generator is a special kind of function that can
Speaker 2: be paused and resumed producing a sequence of values.
Speaker 1: Oh, I think I need an analogy here. This sounds
Speaker 1: a bit abstract.
Speaker 2: Imagine you're reading a book, and you want to be
Speaker 2: able to pause at any point and come back later
Speaker 2: without losing your place. Okay, generators are kind of like
Speaker 2: bookmarks for your code.
Speaker 1: I like that. So using the yield keyword in a
Speaker 1: generator is like placing a bookmark exactly, and.
Speaker 2: The generator function can pick up right where it left off.
Speaker 1: That's really cool. And how are generators related to iterators?
Speaker 2: The generator function actually creates an iterator. When you call
Speaker 2: a generator function, it doesn't run the code right away. Oh, Instead,
Speaker 2: it returns an iterator object, and each time you call
Speaker 2: the next method on that iterator, it runs the generator
Speaker 2: function until it hits a yield statement.
Speaker 1: So it's like stepping through the generator function one bookmark at.
Speaker 2: A time, precisely.
Speaker 1: I see how this could be really useful for things
Speaker 1: like asynchronous operations.
Speaker 2: You're right, generators provide a very elegant way to handle
Speaker 2: a secretous code, especially when combined with promises.
Speaker 1: Okay, my mind is officially blown. All right, let's shift
Speaker 1: gears and talk about one of the most anticipated features
Speaker 1: of ES six. Modules.
Speaker 2: Ah. Yes, modules finally a standardized way to organize our code.
Speaker 1: It's like JavaScript finally grew up.
Speaker 2: I know, right before EES six we had to rely
Speaker 2: on all sorts of ad hoc solutions for modularity, right, all.
Speaker 1: Those different module loaders and bundlers exactly.
Speaker 2: But now we have a built in way to define
Speaker 2: modules in important export code.
Speaker 1: No more global scope pollution exactly.
Speaker 2: Modules make it so much easier to write well structured
Speaker 2: and maintainable code.
Speaker 1: It's a beautiful thing. Now let's talk about a feature
Speaker 1: that might be familiar to developers coming from other languages.
Speaker 2: Classes.
Speaker 1: Classes in ES six provide a more familiar syntax for
Speaker 1: working with objects and inheritance.
Speaker 2: So under the hood, it's still prototypes.
Speaker 1: That's right. Classes are basically syntactic sugar on top of prototypes, so.
Speaker 2: They're not a completely new inheritance model.
Speaker 1: Nope. They just offer a cleaner way to express what
Speaker 1: we were already doing.
Speaker 2: Okay, So it's all about making the code more readable
Speaker 2: and easier to understand.
Speaker 1: Exactly, especially for those coming from class based languages.
Speaker 2: Right, and classes come with all the usual bells and whistles, constructors, methods,
Speaker 2: the extends, keyword.
Speaker 1: You got it. They just make things a bit smoother.
Speaker 2: I'm all for smoother, all right, Onto some new additions
Speaker 2: for handling data, maps, sets, and weak references.
Speaker 1: Maps and sets provide more efficient ways to work with
Speaker 1: key value pairs and unique values.
Speaker 2: Okay, can you give me an example.
Speaker 1: Imagine you're building a shopping cart. You could use a
Speaker 1: map to store the items in the cart, right, where
Speaker 1: the key is the product ID and the value is
Speaker 1: the quantity I see.
Speaker 2: And if you need to keep track of unique visitors
Speaker 2: to your website, you could use a set to store
Speaker 2: their user IDs.
Speaker 1: Ah, makes sense? And what about weak references.
Speaker 2: Weak references are a way to hold a reference to
Speaker 2: an object without preventing it from being garbage collected.
Speaker 1: Interesting, So it's like having a loose grip on an
Speaker 1: object exactly.
Speaker 2: It's useful for situations where you want to associate data
Speaker 2: with an object without affecting its lifespan.
Speaker 1: Got it. Okay, so we've covered a lot of ground
Speaker 1: here in this first part.
Speaker 2: We have.
Speaker 1: We've seen how ES six introduced block scope declarations, the
Speaker 1: spreadurist operator, default parameter values, and destructuring.
Speaker 2: And we've also looked at object literal enhancements, tablet literals, aerofunctions,
Speaker 2: and the four dot of loop.
Speaker 1: Plus those handy new methods for numbers and strings the
Speaker 1: power symbols, and the control offered by iterators and generators.
Speaker 2: We've even touched on modules, classes, and the data handling
Speaker 2: capabilities of maps, sets and weak references.
Speaker 1: It's a lot to take in before we move on
Speaker 1: to what lies beyond YES six. I encourage everyone to
Speaker 1: think about which of these features you're most excited to
Speaker 1: try out in your own projects.
Speaker 2: There's so much to explore and experiment with in the
Speaker 2: world of modern JavaScript, and stay tuned for Part two,
Speaker 2: where we'll venture beyond ES six and into even more
Speaker 2: exciting territory.
Speaker 1: It's going to be a wild ride, all right. So
Speaker 1: we've explored a lot of the core features of ES six.
Speaker 2: Yeah, we've covered a good chunk of it.
Speaker 1: Now I'm really curious to see what lies beyond ES six.
Speaker 2: Buckle up, there's a whole lot more to discover.
Speaker 1: Okay, so where do we start.
Speaker 2: Well, one of the most anticipated features beyond ES six
Speaker 2: is asyncowate. It's all about making asynchronous code look and
Speaker 2: feel more like synchronous code.
Speaker 1: Oh that sounds like a dream come true. I've spent
Speaker 1: countless hours wrestling with callbacks and promises.
Speaker 2: I know, right, asyncowight really simplifies things.
Speaker 1: Okay, so how does it actually work.
Speaker 2: Imagine you're fetching data from an API with promises, you
Speaker 2: typically have these chains of than handlers. Yeah, but with
Speaker 2: a syncowate you can write code that reads more like
Speaker 2: a traditional synchronous flow.
Speaker 1: So no more pyramid of doom exactly.
Speaker 2: You use the awake keyword to pause execution until a
Speaker 2: promise is resolved.
Speaker 1: And that makes the code much easier to read and understand.
Speaker 2: Absolutely, asynchronous code becomes much less daunting.
Speaker 1: I'm sold. Now what about object dot observe. I heard
Speaker 1: that was supposed to be a game changer for change detection. Ah.
Speaker 2: Yes, Object dot observe was a promising feature. It allowed
Speaker 2: you to observe changes to JavaScript objects and get notified
Speaker 2: when properties were added, deleted, or modified.
Speaker 1: Sounds incredibly useful for things like data binding.
Speaker 2: It did. Yeah, Unfortunately it was eventually deprecated due to
Speaker 2: performance concerns and some complexities. Oh that's a shame, it is.
Speaker 2: But the good news is that proxies can be used
Speaker 2: to achieve similar functionality with more control and flexibility.
Speaker 1: Right, we talked about proxies earlier. Okay, so they kind
Speaker 1: of stepped in to fill.
Speaker 2: The gap yep proxies are super powerful.
Speaker 1: Now let's talk about some simpler additions that make life easier,
Speaker 1: like the exponentiation operator.
Speaker 2: Oh yeah, that's a handy one. No more math dot
Speaker 2: pal for simple exponentiation.
Speaker 1: Much more concise. And what about spread syntax for objects?
Speaker 1: I loved using it with a raise.
Speaker 2: Well you're in luck. Spread syntax can now be used
Speaker 2: to copy properties from one object to another.
Speaker 1: Awesome, so we can finally say goodbye to manually copying properties.
Speaker 2: It's a huge time saver.
Speaker 1: And while we're on the topic of handy additions, let's
Speaker 1: not forget about array dot includes.
Speaker 2: Array dot includes makes it super easy to check if
Speaker 2: an array contains a certain value.
Speaker 1: No more writing custom loops or helper functions for that.
Speaker 2: It's the little things that make life easier totally.
Speaker 1: Now let's talk about something that sounds a bit more advanced. CMD.
Speaker 2: CMD stands for single instruction, multiple data. It's a way
Speaker 2: to perform parallel processing.
Speaker 1: Okay, so instead of processing data one element at a time,
Speaker 1: we can process multiple elements simultaneously exactly.
Speaker 2: It can lead to some serious performance games, especially for
Speaker 2: tasks that involve a lot of number crunching.
Speaker 1: Like image or audio processing exactly.
Speaker 2: CMD is a game changer for those kinds of applications.
Speaker 1: It's like having a team of processors working together instead
Speaker 1: of just one.
Speaker 2: It really is. It opens up a whole new level
Speaker 2: of performance for JavaScript.
Speaker 1: I'm impressed JavaScript keeps getting more and more.
Speaker 2: Powerful, and it's doing it without sacrificing its accessibility and
Speaker 2: developer friendliness.
Speaker 1: That's the beauty of it. It's evolving but staying true
Speaker 1: to its roots.
Speaker 2: Well said.
Speaker 1: Okay, before we move on to the final part of
Speaker 1: our deep dep I want to shift gears and talk
Speaker 1: about something a bit different. Type to Raise.
Speaker 2: Ah. Yes, Type to Raise. They're like stepping into the
Speaker 2: engine room of JavaScript in what sense they allow you
Speaker 2: to work with raw binary data in a very structured
Speaker 2: and efficient way.
Speaker 1: Okay, now this is starting to sound a bit intimidating.
Speaker 1: I usually think of JavaScript as dealing with strings, numbers,
Speaker 1: and objects.
Speaker 2: It is a bit of a shift. Yeah, but think
Speaker 2: about scenarios where you need to process large files, manipulate images,
Speaker 2: or work with audio data.
Speaker 1: Those are definitely more specialized use cases.
Speaker 2: They are, but they're becoming more and more common in
Speaker 2: web development.
Speaker 1: I see and type to rays provide a way to
Speaker 1: handle those kinds of tasks more efficiently.
Speaker 2: Exactly. They act as a bridge between JavaScript's high level
Speaker 2: world and the low level world of binary data.
Speaker 1: So it's like giving JavaScript access to the materials.
Speaker 2: Precisely. It opens up a whole new level of control
Speaker 2: and performance.
Speaker 1: Okay, So I'm guessing there's more to type arrays than
Speaker 1: just arrays of ones and zeros. What makes them special?
Speaker 2: Type arrays offer a way to view that binary data
Speaker 2: as different types, like integers, floats, or even custom data structures.
Speaker 1: So we can interpret that raw binary data in different ways.
Speaker 2: Exactly. It's like looking at the same data through different lenses.
Speaker 1: And that gives us more control over how we process
Speaker 1: it exactly.
Speaker 2: Now, the actual binary data is stored in an array buffer.
Speaker 2: What's bad, it's basically a raw block of memory.
Speaker 1: Okay.
Speaker 2: Type rays don't actually store the data themselves. They just
Speaker 2: provide a way to access and interpret that data within
Speaker 2: the array buffer.
Speaker 1: So the array buffer is like the container, and the
Speaker 1: type array is like the map that tells us what's inside.
Speaker 2: That's a good way to think about it, And.
Speaker 1: We can have multiple type derays viewing the same array buffer.
Speaker 2: Absolutely each type array provides a different view of the
Speaker 2: same underlying data.
Speaker 1: That's pretty powerful. Now, working with binary data can be tricky.
Speaker 1: Are there any gotchas we should be aware of?
Speaker 2: Definitely. One thing to be mindful of is indianness.
Speaker 1: Indian Ness I've heard the term, but never really understood
Speaker 1: what it means.
Speaker 2: It refers to the order in which bytes are stored
Speaker 2: in memory. Oka Some systems store the most significant bite first,
Speaker 2: big Indian, while others store the least significant bite first,
Speaker 2: little Indian.
Speaker 1: So it's like writing a number from left to right
Speaker 1: or right to left exactly.
Speaker 2: It can affect how we interpret.
Speaker 1: The data, and JavaScript provides ways to handle that.
Speaker 2: Yes, we can detect and handle indian ness to make
Speaker 2: sure we're reading the data correctly.
Speaker 1: Okay, good to know. Now I'm curious about practical applications.
Speaker 1: Can you give me some real world examples of how
Speaker 1: type rays are used?
Speaker 2: Sure, Image processing is a common use case. Image data
Speaker 2: is basically a grid of pixels, each represented by color values.
Speaker 2: Type arrays can be used to manipulate those pixel values directly,
Speaker 2: allowing for things like brightness adjustments, color transformations, and even
Speaker 2: image compression.
Speaker 1: Wow, can do some serious image manipulation with JavaScript now.
Speaker 2: Absolutely, and because type derays offer efficient access to the data,
Speaker 2: they're great for performance critical tasks.
Speaker 1: What other examples can you think of?
Speaker 2: Audio processing is another big one. Audio data is represented
Speaker 2: as a series of samples. Type derays can be used
Speaker 2: to analyze and manipulate those samples, enabling things like filtering, equalization,
Speaker 2: and even audio synthesis.
Speaker 1: That's amazing. So we can create our own audio effects
Speaker 1: using JavaScript.
Speaker 2: You got it. And because tuch derays are so efficient,
Speaker 2: we can even do real time audio manipulation.
Speaker 1: This is starting to sound a bit like the realm
Speaker 1: of low level languages like C or C plus plus
Speaker 1: our type derays really meant for the average JavaScript developer.
Speaker 2: They are a more specialized feature, but understanding the basics
Speaker 2: can be beneficial even if you don't use them directly.
Speaker 1: So it's good to have them in our mental toolkit exactly.
Speaker 2: It broadens our understanding of how JavaScript works under the hood.
Speaker 1: Okay, so we've talked about type derays providing different views
Speaker 1: of binary data, but how do we actually create those views.
Speaker 2: It's a two step process. First, you create an array buffer,
Speaker 2: which is that raw memory buffer, right, and then you
Speaker 2: create a type array view on top of that buffer,
Speaker 2: specifying the type and size of the view.
Speaker 1: So the array buffer is like the canvas and the
Speaker 1: type deray is like the paintbrush.
Speaker 2: I like that analogy. The type ray doesn't copy the data,
Speaker 2: it just provides a way to access it.
Speaker 1: So if we change the data through one view, those
Speaker 1: changes will be reflected in other views that share the
Speaker 1: same array buffer.
Speaker 2: Exactly, it's all connected.
Speaker 1: What are some of the different types of views we
Speaker 1: can create?
Speaker 2: There are a bunch of type ray constructors, each representing
Speaker 2: a different way to view the data.
Speaker 1: Okay, like what you've got.
Speaker 2: Any array for signed eight bit integers, u inate array
Speaker 2: for unsigned eight bit integers, in sixteen array for signed
Speaker 2: sixteen bit integers, and so on. Okay, And they're also
Speaker 2: float thirty two array and float sixty four array for
Speaker 2: floating point numbers.
Speaker 1: So we have a lot of options depending on the
Speaker 1: kind of data we're working with.
Speaker 2: Exactly, choose the right tool for.
Speaker 1: The job, and don't forget typed arrays are also iterable,
Speaker 1: that's right.
Speaker 2: We can use them with four to sea of loops
Speaker 2: and other iteration techniques.
Speaker 1: It's all coming together. Well. I think we've covered a
Speaker 1: lot of ground. In this second part, we've gone from
Speaker 1: a sincawight to object dot observe to typed rays.
Speaker 2: We've really explored some of the cutting edge features of JavaScript.
Speaker 1: What I find really amazing is how JavaScript is managing
Speaker 1: to evolve and become more powerful without sacrificing its core
Speaker 1: values of accessibility and developer friendliness.
Speaker 2: I agree, it's a testament to the careful design and
Speaker 2: evolution of the language.
Speaker 1: Now, before we jump into the final part of our
Speaker 1: deep dive, I want to leave everyone with a thought
Speaker 1: provoking question. What does this rapid evolution of JavaScript mean
Speaker 1: for the future of web development? How will these advancements
Speaker 1: shape the way we build websites and web applications in
Speaker 1: the years to come? All right, welcome back to the
Speaker 1: final stretch of our deep dive into ES six and beyond.
Speaker 1: We've covered a lot of ground.
Speaker 2: We have, from the foundational features of ESA to some
Speaker 2: of the more specialized areas exactly.
Speaker 1: Now, for this last part, I'm kind of curious to
Speaker 1: see how some of these pieces fit together. We've talked
Speaker 1: about typed arrays for efficient binary data handling, and maps
Speaker 1: and sets for managing collections. How do these powerful tools
Speaker 1: work together because they seem kind of like they're in
Speaker 1: different worlds.
Speaker 2: Yeah, yeah, that's a great point. It might seem that way,
Speaker 2: but they can actually complement each other really well. Okay,
Speaker 2: So well, let's imagine you're building a game and you
Speaker 2: need to represent the game world as a grid, right, okay, yeah, yeah,
Speaker 2: each cell and that grid could be represented by a
Speaker 2: thirty two bit integer, which you could store in a
Speaker 2: un thirty two array. All right, Now, let's say you
Speaker 2: want to store additional information about each cell, like the
Speaker 2: type of terrain or whether it's occupied by a player.
Speaker 2: You could use a map where the keys are the
Speaker 2: cell indices from the un thirty two array, and the
Speaker 2: values are objects containing those extra details.
Speaker 1: So instead of using like nested arrays or objects, which
Speaker 1: can get kind of messy, we have this more struct
Speaker 1: shirt approach using type arrays in.
Speaker 2: A map exactly. You get the efficiency of type arrays
Speaker 2: for the grid data itself and the flexibility of a
Speaker 2: map for associating additional information.
Speaker 1: And I imagine this would scale really well for large
Speaker 1: game worlds.
Speaker 2: Absolutely. It's a great way to manage large data sets efficiently.
Speaker 1: That's cool. Any other applications come to mind? Where you
Speaker 1: might combine type arrays with maps or sets.
Speaker 2: Hmm, let's see what about scientific computing, Like if you're
Speaker 2: working with matrices or vectors, Okay, yeah, you could use
Speaker 2: type arrays to represent those mathematical structures and then use
Speaker 2: sets to efficiently perform set operations like union, intersection and difference.
Speaker 1: So we're leveraging the numerical power of type arrays and
Speaker 1: the set operations of sets to do some pretty complex calculation.
Speaker 2: Precisely, it's all about choosing the right tool for the
Speaker 2: job and combining them in clever ways.
Speaker 1: I'm really seeing the power and flexibility of JavaScript here.
Speaker 2: It's a versatile language for sure.
Speaker 1: Now, before we wrap things up, I think it's where
Speaker 1: noting that while type dearrays are awesome, yeah, they're not
Speaker 1: always the right choice, right. They do add a level
Speaker 1: of complexity, definitely.
Speaker 2: Yeah. If you're working with smaller data sets or your
Speaker 2: application doesn't have strict performance requirements, then traditional arrays and
Speaker 2: objects might be a simpler and more suitable option.
Speaker 1: It's all about choosing the right tool for the job.
Speaker 1: As always.
Speaker 2: Couldn'tgree more.
Speaker 1: Well, I think we've done a pretty good job of
Speaker 1: exploring the world of ES six and beyond. We've covered
Speaker 1: the core features, delved into some specialized areas like type derays.
Speaker 2: Yeah, we've seen how JavaScript is constantly evolving to meet
Speaker 2: the demands of modern web development.
Speaker 1: What I find really fascinating is how it's embracing new
Speaker 1: paradigms while still staying true to its roots of accessibility
Speaker 1: and developer friendliness.
Speaker 2: It's an exciting time to be a JavaScript developer. There's
Speaker 2: always something new to learn, something new to try.
Speaker 1: It's a language that keeps pushing the boundaries of what's
Speaker 1: possible on the web.
Speaker 2: Absolutely, so keep.
Speaker 1: Experimenting, keep learning, and most importantly, have fun coding. That's
Speaker 1: what it's all.
Speaker 2: About out couldn't to said it better myself.
Speaker 1: Well, that's all the time we have for today. Thanks
Speaker 1: for joining us on this deep dive into the world
Speaker 1: of ES six and beyond.